Recently we had a problem with a (pretty large) site. The problem was that the site was created in English, while it should have been created in Dutch. All content was in Dutch of course, but for instance the Site Actions button still said Site Actions, and when adding a document the buttons were "New", "Upload" and "Actions".
In order to solve this a couple of possible solutions were explored:
Saving the site as template didn't work, because you can only see the saved site when you create a site in the original language of the site
...